text: //
  //  VRODriverOpenGLAndroid.cpp
  //  ViroRenderer
  //
  //  Created by Raj Advani on 11/19/18.
  //  Copyright © 2018 Viro Media. All rights reserved.
  //
  //  Permission is hereby granted, free of charge, to any person obtaining
  //  a copy of this software and associated documentation files (the
  //  "Software"), to deal in the Software without restriction, including
  //  without limitation the rights to use, copy, modify, merge, publish,
  //  distribute, sublicense, and/or sell copies of the Software, and to
  //  permit persons to whom the Software is furnished to do so, subject to
  //  the following conditions:
  //
  //  The above copyright notice and this permission notice shall be included
  //  in all copies or substantial portions of the Software.
  //
  //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  //  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  //  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  //  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  //  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  //  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  //  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  #include "VRODriverOpenGLAndroid.h"
  
  // Note this class has limited functionality (most is in the header) but we still require a
  // cpp file in order to have a 'key function' which guarantees we get a strong global symbol
  // for this class in the typeinfo of the library, so that dynamic_cast works across dlopen
  // boundaries.
  //
  // See here: https://github.com/android-ndk/ndk/issues/533#issuecomment-335977747
  VRODriverOpenGLAndroid::VRODriverOpenGLAndroid(std::shared_ptr<gvr::AudioApi> gvrAudio) :
          _gvrAudio(gvrAudio),
          _ft(nullptr) {
  }
  
  VRODriverOpenGLAndroid::~VRODriverOpenGLAndroid() {
      if (_ft != nullptr) {
          FT_Done_FreeType(_ft);
          _ft = nullptr;
      }
  }